Narrow Field of View Zenith Radiometer (NFOV) Handbook

Chiu, C ; Marshak, A ; Hodges, G ; Barnard, JC ; Schmelzer, J

Pacific Northwest National Laboratory (U.S.)

关键词: Optical Properties;    Clouds;    Wavelengths;    Radiometers;    Climates;   

DOI  :  10.2172/1020260
RP-ID  :  DOE/SC-ARM/TR-060
RP-ID  :  DE-AC05-7601830
RP-ID  :  1020260

美国|英语

来源: UNT Digital Library

【 摘 要 】

The two-channel narrow field-of-view radiometer (NFOV2) is a ground-based radiometer that looks straight up and measures radiance directly above the instrument at wavelengths of 673 and 870 nm. The field-of-view of the instrument is 1.2 degrees, and the sampling time resolution is one second. Measurements of the NFOV2 have been used to retrieve optical properties for overhead clouds that range from patchy to overcast. With a one-second sampling rate of the NFOV2, faster than almost any other ARM Climate Research Facility (ACRF) instrument, we are able, for the first time, to capture changes in cloud optical properties at the natural time scale of cloud evolution.